java 密码生成类
生成长度大于6位并必须含有数字+小写字母+大写字母.
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public class StringUtil {private static String [] genkey = {"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"};private static String [] gennum = {"0","1","2","3","4","5","6","7","8","9"};private static String [] genup = {"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"};private static String [] gendown = {"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"};public static String genPwd(int length){StringBuffer sb = new StringBuffer();Random random = new Random();if(length<6){throw new java.lang.IllegalArgumentException("fun StringUtil.genPwd param length must > 6");}sb.append(gendown[random.nextInt(gendown.length)]);sb.append(genup[random.nextInt(genup.length)]);sb.append(gennum[random.nextInt(gennum.length)]);for (int i = 3; i < length; i++) {sb.append(genkey[random.nextInt(genkey.length)]);}return sb.toString();}public static void main(String[] args) {for (int i = 0; i < 100; i++) {System.out.println(genPwd(16));}}}?